两跳OFDM-AF中继系统的自适应比特和功率分配  

Adaptive Bit and Power Allocation for Two Hop OFDM-AF Relaying Systems

作　　者：周明宇[1] 李立华[1] 张平[1] 张晓夏[1] 王海峰 

机构地区：[1]泛网无线通信教育部重点实验室(北京邮电大学) [2]诺基亚技术平台,上海200002

出　　处：《北京邮电大学学报》2008年第3期107-110,共4页Journal of Beijing University of Posts and Telecommunications

基　　金：国家自然科学基金项目(60702051);国家“863计划”项目(2007AA01Z261,2006AA01Z260);高等学校博士学科点专项科研基金项目(20070013028);诺基亚公司合作项目

摘　　要：将自适应比特和功率分配引入两跳正交频分复用-放大转发(OFDM-AF)中继系统,提出了该系统中的比特和功率分配的最优化问题;并结合贪婪算法的思想,提出了一种自适应比特和功率分配算法,在可靠传输要求和发送功率限制的条件下能最大化吞吐量.仿真结果表明,该算法在保证可靠传输的同时,能显著提升系统的有效性.Adaptive bit and power allocation is introduced in two hop orthogonal frequency division multiplexing-amplify and forward （OFDM-AF） relaying systems. The optimization problem for bit and power allocation in the systems is presented. Aiming at the problem, an adaptive bit and power allocation algorithm is proposed, it takes advantage of the idea of Greedy algorithm to maximize throughput subject to the constraint of reliable transmission requirement and transmit power. Simulations indicate that the algorithm will improve the system availability greatly with guaranteeing reliable transmission.

关 键 词：中继系统 正交频分复用 放大转发 自适应比特和功率分配 

分 类 号：TN911.2[电子电信—通信与信息系统]